| A | B |
|---|
| lift | The force pushing an airplane up. |
| thrust | The force pushing an airplane forward. |
| drag | The force pushing against the forward movement on an airplane. |
| gravity | The force pulling an airplane towards the earth. |
| kite | The first manned flying machine. |
| gondola | The basket that carries someone in a hot air balloon. |
| Hot air | Air that rises. |
| Cold air | Air that sinks. |
